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Aqueous ink composition, manufacturing method therefor and image forming method using the same

a technology of ink composition and manufacturing method, applied in the field of ink composition, can solve the problems of poor water resistance, insufficient pigment dispersion, and current techniques that do not provide adequate image properties for practical use, and achieve the effect of binder, stably dispersing pigment, and increasing the density of pigmen

Inactive Publication Date: 2007-02-13
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]The present invention has been devised in order to solve and satisfy the above-mentioned problems and demands, and its object is to provide an aqueous ink composition which makes it possible to increase the density of a pigment and a binder resin, to maintain a stably dispersed pigment for a long time in such an ink without causing an increase in the viscosity, to provide a recorded image with high color tone and high picture quality as well as providing high endurance and high water resistance when an image-recording process is carried out by using the ink, and a manufacturing method for the above-mentioned aqueous ink composition as well as an image forming method using the above-mentioned aqueous ink composition.

Problems solved by technology

However, aqueous inks are problematic in that pigment dispersion is still insufficient, a problem that has not been completely solved, and at present, images formed by using an aqueous print ink have problems in fastness, and, in particular, poor water-resistance.
Accordingly, the current techniques do not provide adequate image properties for practical use.
At present, in the case when a non-solvent-type ink needs to be obtained, an aqueous print ink with inferior image characteristics has to be used.
However, in general, water-soluble dye possesses inferior water resistance and light resistance when compared with pigment, hence an image recorded with ink containing a dye also has inferior water and light resistance.
Moreover, most of these dyes are highly water-soluble, and tend to have strong electron bonds in their chemical structures, with the result that they tend to be ahrmful to humans.
Moreover, ink-jet recording processes using dye-containing inks have failed to achieve sufficient color reproducibility on regular paper (although sufficient color reproduction range is obtainable if special paper is used).
However, at present, dispersants and solvents having sufficient characteristics have yet to be obtained.
However, in the case when a great amount of the polymer compound disclosed in any one of the above-mentioned patent documents 1 to 4 is added to the ink, the ink viscosity increases, making it impossible to apply as an ink-jet recording ink.
Moreover, another problem is that an image recorded by using an ink disclosed in any one of the above-mentioned patent documents 1 to 4 has inferior resistance to water.

Method used

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  • Aqueous ink composition, manufacturing method therefor and image forming method using the same

Examples

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example 1

[0115]A copolymer (200 g) (random ternary copolymer of styrene-acrylic acid-hexyl acrylate: weight-average molecular weight 19,000, copolymer ratio (weight)=36 / 18 / 46, acid value 120, glass transition point 55° C., fluidity starting point 90° C., decomposition point 237° C., deposition starting point pH 5.8), 750 g of distilled water and 21 g of potassium hydroxide are gradually dissolved while being mixed, and the resulting solution is subjected to a dissolving and colloid-solution preparing process by using a three-one motor propeller stirring device for 5 hours and 30 minutes while being heated to 89° C. Finally, the solution is concentration-adjusted to prepare a colloid water solution having a solid-component concentration of 20% by weight (with an average colloid diameter of 52 nm, pH 8.1).

[0116]This colloid solution and a copper phthalocyanine blue ultra-fine particle pigment (primary average particle size: 32 nm) are mixed at a solid component ratio of 4:6, and to this is add...

example 2

[0133]A copolymer (450 g) (block copolymer of α-methyl styrene-acrylic acid-butyl acrylate: weight-average molecular weight 9,000, copolymer ratio (weight)=30 / 15 / 50, acid value 108, glass transition point 39° C., fluidity starting point 76° C., decomposition starting point 209° C., deposition starting point pH 6.2), 1000 g of distilled water and 200 g of tetramethyl ammonium hydroxide (25% by weight water solution) are dissolved while being mixed, and the resulting solution is subjected to a dissolving and colloid-solution preparing process by using a three-one motor propeller stirring device for 4 hours while being heated to 90° C. Finally, the solution is concentration-adjusted to prepare a colloid water solution having a solid-component concentration of 40% by weight (with an average colloid diameter of 80 nm, pH 8.2).

[0134]This colloid solution and a copper phthalocyanine blue ultra-fine particle pigment are mixed at a solid component ratio of 5:5, and mixed and dispersed by usi...

example 3

[0137]A copolymer (400 g) (block copolymer of α-methyl styrene-methacrylic acid-butyl methacrylate: weight-average molecular weight 17,000, copolymer ratio (weight)=36 / 14 / 50, acid value 111, glass transition point 75° C., fluidity starting point 104° C., decomposition starting point 235° C., deposition starting point pH 6.2), 11 g of potassium hydroxide and 1700 g of distilled water are dissolved while being mixed, and the resulting solution is subjected to a dissolving and colloid-solution preparing process by carrying out a high-strength forceful stirring process using a three-one motor propeller stirring device for 6 hours while being heated to 90° C. Finally, the solution is concentration-adjusted to prepare a colloid water solution having a solid-component concentration of 20% by weight (with an average colloid diameter of 32 nm, pH 8.1).

[0138]Next, this colloid solution and an azo-based red ultra-fine particle pigment are mixed at a solid component ratio of 8:2, and to this is...

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Abstract

The invention provides an aqueous ink composition, which comprises at least: 1) an alkali neutralized product of a copolymer containing constituent units of: (i) at least one monomer selected from the group consisting of alkene, styrene, styrene derivatives, vinyl naphthalene, and vinyl naphthalene derivatives; (ii) at least one monomer selected from monomers containing an acidic group that ion dissociate; and (iii) at least one α,β-ethylenic unsaturated carboxylic acid alkyl ester; 2) a pigment; and 3) an aqueous medium, wherein the alkali neutralized product of the copolymer in the aqueous ink composition forms micelle aggregations with an average diameter being set in the range of 10 nm to 300 nm. A manufacturing method of the aqueous ink composition and an image forming method using the aqueous ink composition are also provided.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an aqueous ink composition, a manufacturing method therefor and an image forming method using said aqueous ink composition.[0003]2. Description of the Related Art[0004]Along with the recent increased awareness for environmental conservation, the application of aqueous media in place of organic solvents has been recommended and even legally imposed in various fields.[0005]For example, in the paint field, there has been a strong demand for a switch from organic solvent-type paints to water-based paints and non-solvent-type paints (electrostatic powder paints, etc.). Moreover, in the printing field as well, there are demands for legal restrictions to impose the application of aqueous print inks in order to improve areas such as printing work environments. Hence, there has been a rush to develop aqueous print inks. However, aqueous inks are problematic in that pigment dispersion is still ins...

Claims

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Application Information

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IPC IPC(8): C09D11/10B41J2/01C08L23/00C08L25/08C08L33/02C08L33/08C08L33/10B41M5/00C09D11/00C09D11/322C09D11/38
CPCC09D11/322C09D11/30
Inventor AKUTSU, EIICHIOHTSU, SHIGEMISHIMIZU, KEISHIYATSUDA, KAZUTOSHIMIKAMI
Owner FUJIFILM BUSINESS INNOVATION CORP
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